Add OpenRouter as API provider option

Enables access to 200+ models via OpenRouter's unified API, including
Claude, Gemini, GPT-4o, and DeepSeek variants.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: nioasoft

registry.py

@@ -658,6 +658,20 @@ def get_all_settings() -> dict[str, str]:
         ],
         "default_model": "qwen3-coder",
     },
+    "openrouter": {
+        "name": "OpenRouter",
+        "base_url": "https://openrouter.ai/api/v1",
+        "requires_auth": True,
+        "auth_env_var": "ANTHROPIC_API_KEY",
+        "models": [
+            {"id": "anthropic/claude-sonnet-4-5", "name": "Claude Sonnet 4.5"},
+            {"id": "anthropic/claude-opus-4", "name": "Claude Opus 4"},
+            {"id": "google/gemini-2.5-pro", "name": "Gemini 2.5 Pro"},
+            {"id": "openai/gpt-4o", "name": "GPT-4o"},
+            {"id": "deepseek/deepseek-chat-v3-0324", "name": "DeepSeek V3"},
+        ],
+        "default_model": "anthropic/claude-sonnet-4-5",
+    },
     "custom": {
         "name": "Custom Provider",
         "base_url": "",

ui/src/components/SettingsModal.tsx

@@ -24,6 +24,7 @@ const PROVIDER_INFO_TEXT: Record<string, string> = {
   kimi: 'Get an API key at kimi.com',
   glm: 'Get an API key at open.bigmodel.cn',
   ollama: 'Run models locally. Install from ollama.com',
+  openrouter: 'Access 200+ models. Get an API key at openrouter.ai',
   custom: 'Connect to any OpenAI-compatible API endpoint.',
 }